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Enhance a bunch of transformations in instcombine to start generating

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exact/nsw/nuw shifts and have instcombine infer them when it can prove
that the relevant properties are true for a given shift without them.

Also, a variety of refactoring to use the new patternmatch logic thrown
in for good luck.  I believe that this takes care of a bunch of related
code quality issues attached to PR8862.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125267 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2011-02-10 05:36:31 +00:00
parent b20c0b5092
commit 7a6aa1a391
12 changed files with 197 additions and 161 deletions
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4
test/Transforms/InstCombine/trunc.ll
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@@ -24,7 +24,7 @@ define i64 @test2(i64 %a) {
ret i64 %d
; CHECK: @test2
; CHECK: shl i64 %a, 36
; CHECK: %d = ashr i64 {{.*}}, 36
; CHECK: %d = ashr exact i64 {{.*}}, 36
; CHECK: ret i64 %d
}
define i64 @test3(i64 %a) {
@@ -92,7 +92,7 @@ define i64 @test8(i32 %A, i32 %B) {
; CHECK: @test8
; CHECK: %tmp38 = zext i32 %A to i64
; CHECK: %tmp32 = zext i32 %B to i64
; CHECK: %tmp33 = shl i64 %tmp32, 32
; CHECK: %tmp33 = shl nuw i64 %tmp32, 32
; CHECK: %ins35 = or i64 %tmp33, %tmp38
; CHECK: ret i64 %ins35
}